mime-types

I tried to install Uwe Ohse's patch for filetypes, but there is a lack 
of documentation. I want publicfile to support jpg-files. When altering 
the source this way, it works fine:

filetyp.c:
under this line
    else if (str_equal(x,".jpeg")) result = "image/jpeg";
I add the line:
    else if (str_equal(x,".jpg")) result = "image/jpeg";

But applying Uwe Ohse patch does noet work. Maybe I'm doing something 
wrong:

mkdir /public/httpd/env
echo "\"image/jpeg\"" > /public/httpd/env/CT_jpg
echo "\"image/jpeg\"" > /public/httpd/env/CT_JPG

I alter the runfile as follows (I add "/usr/local/bin/envdir 
/public/httpd/env"):

#!/bin/sh
exec 2>&1
exec /usr/local/bin/envdir /public/httpd/env /usr/local/bin/envuidgid 
qftp softlimit -o20 -d50000 tcpserver -vDRHl0 -b50 -c100 0 80 
/usr/local/publicfile/bin/httpd /public/file

Anybody a hint?

Richard.